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M1A and Odd Headspace Question

5K views 34 replies 15 participants last post by  canmancan 
Case head Space after Firing

The cases will come out longer even with the valve off sometimes, I do not know why, it happens in my rifles to some limited extent.

My best M1A has a HS of 1.638", this is the most accurate M1A of the two using Hand loads. The other M1A has a HS of 1.624", this rifle will not accept any ammunition other than Hand loads.

Your situation may be similar, in that, all "Out of the Box" ammo is going to grow longer than you desire, limiting the reloading of such cases. I have excepted the use of once fired case as a standard procedure in accuracy shooting. In both riles I set the shoulder back .005/6" under chamber Head Space. You may have to consider doing something like this to get the full potential of your rifle.
 
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